Enabling the “Hide On My Computer folders” checkbox in Outlook’s General Preferences

One of the more useful (to me) features in Outlook is the ability to hide the On My Computer directories in Outlook. There’s a checkbox in Outlook’s preferences, in the General section, that enables it. It’s also possible to enable this using a defaults command:

Like this:

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how do you find these hidden “defaults write” options? Like what told you that “HideFoldersOnMyComputerRootInFolderList” was the key to use? I understand that sometimes you can find/see them in the plist, but what about when you can’t? There are so many commands that people seemingly just know.